AC Charging Speed Reduced — Grid or Vehicle Condition
The TESLA-PCS_A019 (Tesla Power Conversion System (PCS)) EV fault code means: AC Charging Speed Reduced — Grid or Vehicle Condition. This is a minor severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $0 in the common case (retry, different outlet or equipment); electrician work billed by the job if building wiring is at fault. Vehicle-side repair, if it comes to that, is diagnosed and quoted by Tesla service.
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Common Symptoms
- Alert on the touchscreen: "Power grid or vehicle issue limiting AC charging — Unplug and retry / Try different charging location"
- AC charging noticeably slower than the equipment's rated speed
- DC fast charging / Supercharging still works normally
- Driving is unaffected
Probable Causes (Ranked by Likelihood)
- Power supply disturbances from the external charging equipment or the electrical grid reducing AC charging speed Likely
- Nearby electric devices drawing a lot of power on the same supply Possible
- A condition with the vehicle itself affecting AC charging (only if the equipment and grid causes are ruled out) Unlikely
Frequently Asked Questions
What does PCS_a019 mean on a Tesla?
Tesla's official meaning: AC charging speed has been reduced by a condition affecting the vehicle's ability to charge with AC power — possibly disturbances from the charging equipment or the grid, or nearby high-draw devices. DC fast charging / Supercharging still works normally.
How do I fix PCS_a019?
Unplug and retry first. Then isolate the cause by trying a different outlet or different charging equipment; have an electrician inspect the wiring if the original equipment or outlet is at fault. If it persists across multiple locations and equipment, schedule Tesla service.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
If another alert appears alongside this one specifying the condition affecting AC charging, investigate that alert first — per Tesla's official guidance.
Unplug, then retry. If the slow rate persists, isolate: Mobile Connector → different wall outlet; Wall Connector → different equipment on a separate outlet.
If the original outlet or Wall Connector is at fault, have an electrician inspect the wiring connection.
Supercharging is unaffected — a Supercharger or Destination Charger is a good fallback.
If the alert persists across multiple locations and different equipment, the vehicle itself may be limiting AC charging — schedule Tesla service.
Sources 4
This page is built from documented references. Verify against your own service info before repair work.
- Tesla Model 3 Owner's ManualTroubleshooting Alerts (official Tesla alert text for PCS_a019)
- Tesla Model Y Owner's ManualTroubleshooting Alerts (confirms PCS_a019 is documented across models)
- Tesla firmware alert reference (core-hacked/tesla-alerts-dictionary): pcs_a019community-maintained dictionary, not an official manufacturer document
- Tessie Tesla alert statisticsthird-party Tesla alert reference with owner-telemetry frequency — not an official Tesla document
Commonly Affected Vehicles
- Tesla Model 3
- Tesla Model Y
- Tesla Model S
- Tesla Model X
- Tesla Cybertruck
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